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.\" $OpenBSD: audioctl.1,v 1.11 2000/11/21 13:58:06 aaron Exp $
.\" $NetBSD: audioctl.1,v 1.7 1998/04/27 16:55:23 augustss Exp $
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" Author: Lennart Augustsson
.\"
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.\"    must display the following acknowledgement:
.\"        This product includes software developed by the NetBSD
.\"        Foundation, Inc. and its contributors.
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.\"    from this software without specific prior written permission.
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.Dd May 4, 1997
.Dt AUDIOCTL 1
.Os
.Sh NAME
.Nm audioctl
.Nd control audio device
.Sh SYNOPSIS
.Nm audioctl
.Op Fl n
.Op Fl f Ar file
.Fl a
.Nm audioctl
.Op Fl n
.Op Fl f Ar file
.Ar name
.Op Ar ...
.Nm audioctl
.Op Fl n
.Op Fl f Ar file
.Fl w
.Ar name=value
.Op Ar ...
.Sh DESCRIPTION
The
.Nm
command displays or sets various audio system driver variables.
If a list of variables is present on the command line,
.Nm
prints the current value of those variables for the specified device.
By default,
.Nm
operates on the
.Pa /dev/audioctl
device.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl a
Print all device variables and their current values.
.It Fl w Ar name=value
Attempt to set the specified variable
.Ar name
to
.Ar value .
.It Fl f Ar file
Specify an alternative audio control device.
.It Fl n
Suppress printing of the variable name.
.El
.Sh EXAMPLES
To set the playing sampling rate to 11025 you can enter
.Pp
.Dl audioctl -w play.sample_rate=11025
.Pp
Note that many of the variables that can be inspected and changed
are reset when the device is opened.
This can be circumvented like so:
.Pp
.Dl (cat file.au; audioctl -f /dev/stdout -a) > /dev/audio
.Pp
or
.Pp
.Dl (audioctl -f /dev/stdout -w blocksize=1024; cat file.au) > /dev/audio
.Sh ENVIRONMENT
The following environment variables affect the execution of
.Nm audioctl :
.Bl -tag -width AUDIOCTLDEVICE
.It Ev AUDIOCTLDEVICE
Audio control device to use.
.El
.Sh FILES
.Bl -tag -width /dev/audioctl
.It Pa /dev/audioctl
default audio control device
.El
.Sh SEE ALSO
.Xr mixerctl 1 ,
.Xr audio 4 ,
.Xr sysctl 8
.Sh HISTORY
The
.Nm
command first appeared in
.Nx 1.3 .